/* funds2.c -- 传递指向结构的指针 */
#include <stdio.h>
#define FUNDLEN 50
struct funds
{
    char bank[FUNDLEN];
    double bankfund;
    char save[FUNDLEN];
    double savefund;
};
double sum(const struct funds *); /* 参数是一个指针 */
int main(void)
{
    struct funds stan = {
        "Garlic-Melon Bank",
        4032.27,
        "Lucky's Savings and Loan",
        8543.94};
    printf("Stan has a total of $%.2f.\n", sum(&stan));
    return 0;
}
double sum(const struct funds *money)
{
    return (money->bankfund + money->savefund);
}